I make countdown cards for our trips. I print them on the computer, business card size, with a different character clip art on each day. We change the card during breakfast.
When I traveled with work and my kids were young, I would make a paper chain to show how many days were left until I returned. You could do the same for disney. Write the number of days left until you leave on each chain and then they tear off a paper each day. The chain gets shorter and shorter the closer you get.